Add nuance speech provider (#144)

* add nuance as Synthesis recognizer

* fix getStatus for cred test check

* add all languages

* fixup nuance voice names

* fix label focus issue

Co-authored-by: eglehelms <e.helms@cognigy.com>
Co-authored-by: Dave Horton <daveh@beachdognet.com>

src/api/types.ts

@@ -258,6 +258,8 @@ export interface SpeechCredential {
   custom_tts_endpoint: null | string;
   use_custom_stt: number;
   custom_stt_endpoint: null | string;
+  client_id: null | string;
+  secret: null | string;
 }
 
 export interface Alert {